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Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission toa ring of multiple radio access units None

Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 2,   Pages 300-306 doi: 10.1631/FITEE.1700056

Abstract:

A radio-over-fiber (RoF) distributed antenna system (DAS) architecture is proposed, where millimeterwave (mm-wave) signals are transmitted to four different radio access units (RAUs) arranged in a ringThe radio frequency (RF) signals are transmitted by polarization multiplexing a multi-wavelength source

Keywords： Radio over fiber     Millimeter wave     Radio access units    

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The Technical Scheme and Key Equipment for Solving the Difficult Technical Problems of Underground Radio

Situ Mengtian

Strategic Study of CAE 2001, Volume 3, Issue 7,   Pages 64-69

Abstract:

Two difficult tedhnical problems in underground radio communications, i.e. weak signal reception and

Keywords： underground radio communications     weak signal reception     counter lightning interference    

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FM Radio Based Non-cooperative Bistatic Radar Experimental System

Wang Yan

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 39-42

Abstract:

An experimental FM radio based non-cooperative bistatic radar is briefly

Keywords： FM radio     non-cooperative bistatic radar     LOS signal     equalization     DBF    

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Kinematic calibration of precise 6-DOF stewart platform-type positioning systems for radio telescope

Juan Carlos JáUREGUI, Eusebio E. HERNáNDEZ, Marco CECCARELLI, Carlos LóPEZ-CAJúN, Alejandro GARCíA

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3,   Pages 252-260 doi: 10.1007/s11465-013-0249-7

Abstract:

The pose accuracy of a parallel robot is a function of the mobile platform posture. Thus, there is no a single value of the robot’s accuracy. In this paper, two novel methods for estimating the accuracy of parallel robots are presented. In the first method, the pose accuracy estimation is calculated by considering the propagation of each error, i.e., error variations are considered as a function of the actuator’s stroke. In the second method, it is considered that each actuator has a constant error at any stroke. Both methods can predict pose accuracy of precise robots at design stages, and/or can reduce calibration time of existing robots. An example of a six degree-of-freedom parallel manipulator is included to show the application of the proposed methods.

Keywords： pose errors     error estimation     parallel robot     radio telescopes    

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Performance of fiber reinforced clayey sand composite

Amin CHEGENIZADEH, Hamid NIKRAZ

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2,   Pages 147-152 doi: 10.1007/s11709-012-0158-6

Abstract: Recent researches show some interests in investigation of inclusion of randomly distributed fiber instudy is related to effective parameters on strength of the clayey sand composite with using natural fiberand plastic fiber and different fiber contents and length.The fiber percentage varied from 0% (for unreinforced samples) to 4% and fiber length varied from 8 toThe fiber length and fiber content found to play important rule on the strength of fiber reinforced composite

Keywords： triaxial     consolidated undrained (CU)     fiber     strength    

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Mechanical properties of steel, glass, and hybrid fiber reinforced reactive powder concrete

Atheer H.M. ALGBURI, M. Neaz SHEIKH, Muhammad N.S. HADI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 4,   Pages 998-1006 doi: 10.1007/s11709-019-0533-7

Abstract: This study examines the properties of fiber-reinforced reactive powder concrete (FR-RPC).Steel fibers of 13 mm length and 0.2 mm diameter were used to prepare the steel fiber-reinforced RPCGlass fibers of 13 mm length and 1.3 mm diameter were used to prepare the glass fiber-reinforced RPCThe hybrid fiber-reinforced RPC (HFR-RPC) was prepared by mixing 0.9% steel fibers and 0.6% glass fibers

Keywords： reactive powder concrete     steel fiber     glass fiber     hybrid fiber    

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Modeling of heat and mass transfer for timber during radio-frequency and convective drying

Jia Xiaoran,Zhao Jingyao and Cai Yingchun

Strategic Study of CAE 2014, Volume 16, Issue 4,   Pages 106-112

Abstract: medium heat and mass transfer，combined with the mechanism and characteristics of heat mass transfer in radio-frequency

Keywords： timber     radio- frequency- convective drying     mathematical model     difference equation    

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The Latest Development of Optical Fiber, Optical Fiber Band and Optical Cable Technology Abroad

Liu Liangyan

Strategic Study of CAE 2001, Volume 3, Issue 9,   Pages 86-94

Abstract: this paper, new development about the study of dispersion-compensable low transmission loss optical fiber, nonzero dispersion displacement optical fiber, and carbon-coated or silicon nitride-coated opticalfiber (applied in bad environment) was comprehensively introduced.Then the manufacture technology of band optical fiber including its structure, coatings, properties andMulti-core optical fiber band cable manufacture technology such as twisted loose-tube, center loose-tube

Keywords： optical communication     low transmission loss optical fiber     optical fiber band     band optical fiber cable    

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Study on Several Radio Propagation Models in ITU - R Recommendations

Zhang Minggao

Strategic Study of CAE 2000, Volume 2, Issue 7,   Pages 74-78

Abstract:

Studies are presented on five radio propagation models in ITU - R recommendations.

Keywords： radio propagation     tropospheric scatter     sea reflection     ionospheric scintillation     attenuation by atmospheric    

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Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiber-reinforced concrete

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 3,   Pages 411-428 doi: 10.1007/s11709-023-0928-3

Abstract: In this study, ultrahigh-performance fiber-reinforced concrete (UHPFRC) used in a type B70 concrete sleeperThe main parameters investigated are the steel fiber volume fractions (0%, 0.5%, 1%, and 1.5%).study results show that the behavior of UHPFRC sleepers improves significantly when the amount of steel fiberSleepers manufactured using UHPFRC with a steel fiber volume fraction of 1% and a concrete volume less

Keywords： pre-stressed concrete sleeper     ultrahigh performance fiber-reinforced concrete     pull-out test     staticbending test     steel fiber     aspect ratio     volume fraction    

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Studies of fiber-matrix debonding

Navneet DRONAMRAJU,Johannes SOLASS,Jörg HILDEBRAND

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4,   Pages 448-456 doi: 10.1007/s11709-015-0316-8

Abstract: In this paper, the debonding of a single fiber-matrix system of carbon fiber reinforced composite (CFRPtangential slip distance and artificial damping coefficient on the debonding length at the interface of the fiber-matrix

Keywords： single fibre     cohesive zone model     interface debonding     carbon fiber reinforced composite (CFRP)    

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Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 82-92 doi: 10.1007/s11705-022-2181-z

Abstract: The amination of alkyl alcohols is one of the most promising paths in synthesis of aliphatic amines. Herein, cerium doped nickel-based catalysts were synthesized and tested in a gas-phase amination of n-hexanol to n-hexylamine. It was found that the activity of the Ni/γ-Al2O3 catalyst is significantly improved by doping an appropriate amount of cerium. The presence of cerium effectively inhibits the agglomeration of nickel particle, resulting in better Ni dispersion. As Ni particle size plays critical role on the catalytic activity, higher turnover frequency of n-hexanol amination was achieved. Cerium doping also improves the reduction ability of nickel and enhances the interactions between Ni and the catalyst support. More weak acid sites were also found in those cerium doped catalysts, which promote another key step—ammonia dissociative adsorption in this reaction system. The overall synergy of Ni nanoparticles and acid sites of this Ni–Ce/γ-Al2O3 catalyst boosts its superior catalytic performance in the amination of n-hexanol.

Keywords： amination     alcohol     cerium     nickel     acidity     interaction    

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Time- and temperature-dependence of compressive and tensile behaviors of polypropylene fiber-reinforced

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 4,   Pages 1025-1037 doi: 10.1007/s11709-021-0741-9

Abstract: The understanding of compressive and tensile behaviors of polypropylene fiber-reinforced cemented paste

Keywords： cemented paste backfill     fiber reinforcement     constitutive behavior     temperature     tailings    

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Fabrication of recyclable Fe chelated aminated polypropylene fiber for efficient clean-up of phosphate

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 7,   Pages 840-852 doi: 10.1007/s11705-022-2253-0

Abstract: Herein, a Fe3+-loaded aminated polypropylene fiber has been reported as an efficient phosphateThe remarkable phosphate removal ability of the fiber is due to Fe3+ immobilization, and itAdsorption experiments showed that the fiber is applicable over a wide pH range from 2 to 9.The adsorption equilibrium of the fiber for phosphate was reached within 60 min, indicating an efficientOverall, this study proves that the fiber possesses many advantages for phosphate removal, including

Keywords： phosphate adsorption     aminated polypropylene fiber     Fe3+     ligand exchange     reusability    

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Supersonic flows over cavities

FANG Tianwen, DING Meng, ZHOU Jin

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 528-533 doi: 10.1007/s11708-008-0055-9

Abstract: The characteristics of supersonic cold flows over cavities were investigated experimentally and numerically

Keywords： supersonic     different     ratio    

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Title Author Date Type Operation

Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission toa ring of multiple radio access units

Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR

Journal Article

The Technical Scheme and Key Equipment for Solving the Difficult Technical Problems of Underground Radio

Situ Mengtian

Journal Article

FM Radio Based Non-cooperative Bistatic Radar Experimental System

Wang Yan

Journal Article

Kinematic calibration of precise 6-DOF stewart platform-type positioning systems for radio telescope

Juan Carlos JáUREGUI, Eusebio E. HERNáNDEZ, Marco CECCARELLI, Carlos LóPEZ-CAJúN, Alejandro GARCíA

Journal Article

Performance of fiber reinforced clayey sand composite

Amin CHEGENIZADEH, Hamid NIKRAZ

Journal Article

Mechanical properties of steel, glass, and hybrid fiber reinforced reactive powder concrete

Atheer H.M. ALGBURI, M. Neaz SHEIKH, Muhammad N.S. HADI

Journal Article

Modeling of heat and mass transfer for timber during radio-frequency and convective drying

Jia Xiaoran,Zhao Jingyao and Cai Yingchun

Journal Article

The Latest Development of Optical Fiber, Optical Fiber Band and Optical Cable Technology Abroad

Liu Liangyan

Journal Article

Study on Several Radio Propagation Models in ITU - R Recommendations

Zhang Minggao

Journal Article

Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiber-reinforced concrete

Journal Article

Studies of fiber-matrix debonding

Navneet DRONAMRAJU,Johannes SOLASS,Jörg HILDEBRAND

Journal Article

Reductive amination of -hexanol to -hexylamine over Ni–Ce/-AlO catalysts

Journal Article

Time- and temperature-dependence of compressive and tensile behaviors of polypropylene fiber-reinforced

Journal Article

Fabrication of recyclable Fe chelated aminated polypropylene fiber for efficient clean-up of phosphate

Journal Article

Supersonic flows over cavities

FANG Tianwen, DING Meng, ZHOU Jin

Journal Article